These look like a lot of fun!! Right now at Walmart, you can get these Razor Turbo Jetts Electric Heel Wheels for Only $39.93 Shipped! (Reg. $117). Hit new heights of fun with the all-new Razor Turbo Jetts Electric Heel Wheels! Simply start rolling and these electric-powered heel wheels amp up the action with an 80-watt, geared-drive motor to provide a one-of-a-kind boost to any pair of sneakers. Remoteless, the Turbo Jetts use an integrated, pressure-sensitive, power control system to help you ride comfortably at speeds up to 10 mph (16 km/h) for up to 30 minutes of continuous use. Simply step into the heavy-duty polymer “quick click” frame and tighten the hook-and-loop strap for a secure fit for sneakers U.S. size youth 12 to adult 12 (European youth 42 through adult 45).